40131998 has 8 divisors (see below), whose sum is σ = 62273880. Its totient is φ = 19374040.

The previous prime is 40131997. The next prime is 40132003. The reversal of 40131998 is 89913104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×40131998² = 3221154526944008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40131997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345908 + ... + 346023.

It is an arithmetic number, because the mean of its divisors is an integer number (7784235).

Almost surely, 2^40131998 is an apocalyptic number.

40131998 is a deficient number, since it is larger than the sum of its proper divisors (22141882).

40131998 is a wasteful number, since it uses less digits than its factorization.

40131998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691962.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 40131998 is about 6334.9820836369. The cubic root of 40131998 is about 342.3709652990.

The spelling of 40131998 in words is "forty million, one hundred thirty-one thousand, nine hundred ninety-eight".